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SELECT * FROM `Item` LEFT JOIN `IndexEntry` USING (ItemID) WHERE FIND_IN_SET(:'Singleplayer',`Categories`) AND `IsHidden` = 0 AND `Item`.`IsDeleted` = 0 AND `Language` = 'English' AND `LinkText` LIKE 'E%' ORDER BY `LinkText`, `Item`.`Summary` ASC LIMIT 500 OFFSET 0
- The Eight Queens problem. Put eight queens on the board such that no one attacks another. Author: Hans L. Bodlaender.
- Exclusive Chess. Mate is only allowed if there is a unique way to do so. Author: Hans L. Bodlaender. Inventor: Theodor Steubel.
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